Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
4, 9, 19, 39, ?
Option 1: 49
Option 2: 59
Option 3: 79
Option 4: 89
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Correct Answer: 79
Solution :
Given
:
4, 9, 19, 39, ?
Multiply each number by 2 and add 1 to the resultant to find the next term.
(4 × 2) + 1 = 8 + 1 = 9;
(9 × 2) + 1 = 18 + 1 = 19;
(19 × 2) + 1 = 38 + 1 = 39;
(39 × 2) + 1 = 78 + 1 = 79
So, the missing number is 79. Hence, the third option is correct.
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